79Exciter440

I Just bought a 79 Exciter 440, i pulled the main bolt out of the clutch to replace the primary sheave, it was shattered in pieces. Anywho, i got the old clutch off and went to put the new one on and the main bolt wont screw into the crank all the way, it screws in about 4 turns then gets really tight. any chances when i removed that bolt that it messed up the threads? If so what size are these threads inside the crank so i can try and Tap them to straighten them out. If that doesnt work it looks like ill need a new crank. Any information would be appreciated.

Renagade

first thing id do is make sure the whole
bolt is out, but for sure chase the threads!!
also spray some pb blaster while taping out.
after done make sure to clean threads with brake
cleaner.
as for the tap size, either match up to new
bolt, or..........
wait for yamadad to ans. im sure he knows!!!!!

good luck

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current sleds
04 rev800ho gade
95 formulaIII 600
77 olympic 340e-mint!!

79Exciter440

I tilted the sled on its side and sprayed Pb blaster in the shaft and let it sit for a night. the threads on the original bolt are still perfectly in tact. I got frustrated with it and walked away last night, plan on waiting until the weekend to sit down and mess with it.

yamadad4

1/2"x 18 comes to mind as the thread pitch, but you would be wise to confirm prior to inserting any thread cleaning implements.

RJ Gleason

Sounds like you might have cross threaded it.
Does the end of the bolt threads look as if they are trying to cut new ones?

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Old Cat Rider
'93 Wildcat 700EFI
w/ Comet 108 Pro-4 clutch & 01 ZR skid

'90 Wildcat Project in progress.

Vintage (sorta)
1980 Indy Trail 440 (for sale)
1980 AC Pantera (donor engine to the 90 wildcat)


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79Exciter440

Then very end of the Bolt looks a little out of place now that i look at it. the first two threads look a little different than the others. Should i just get a new bolt or try and run a Die on the old one? Threads inside the crank dont look out of place to my eyes.

Yamaha440

You may want to try threading the bolt without the sheave on. I find that the weight of the sheave causes resistance to threading it. If the bolt threads on fine without the sheave, then try to support the weight of the sheave while your trying to thread the bolt, i.e. pulling up on the sheave.

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My Current Sled:
1997 Yamaha Vmax XTC 600 Twin ER 6290 MI - Stock... for now...

Old Iron:
1979 Yamaha Exciter 440 6042 MI (9825 KM)
1979 Yamaha Exciter 440 7,000 MI (11266 KM)

WAKE-UP AND SMELL THE TWO STROKE